To use NVIDIA scaling with fixed aspect ratio
Note: These instructions apply to Windows XP. For Windows Vista and later, see Scale my desktop – Windows Vista and later
From the NVIDIA Control Panel navigation tree pane, under Display, click Adjust desktop size and position to open the associated page.
Click the image that represents your flat panel display, or non-HD digital display connected to the HDMI, DisplayPort, or DVI connector.
Select Use NVIDIA scaling with fixed aspect ratio, then click Apply.